Find all TextBox Controls in ASP.Net Page using C# and VB.Net

Hi IamAzhar,

If you are looking to find id dynamically created textbox so refer below sample will help out.

HTML

<asp:Button Text="Get" runat="server" OnClick="GetId" />

Code

C#

protected void Page_Load(object sender, EventArgs e)
{
    for (int i = 0; i < 3; i++)
    {
        TextBox txt = new TextBox();
        txt.ID = "A" + i;
        form1.Controls.Add(txt);
    }
}

protected void GetId(object sender, EventArgs e)
{
    string id = "";
    foreach (TextBox textBox in form1.Controls.OfType<TextBox>())
    {
        id += textBox.ID + ",";
    }
    ScriptManager.RegisterStartupScript(this, this.GetType(), "", "alert('" + id.Trim(',') + "');", true);
}

VB.Net

Protected Sub Page_Load(ByVal sender As Object, ByVal e As EventArgs) Handles Me.Load
    For i As Integer = 0 To 3 - 1
        Dim txt As TextBox = New TextBox()
        txt.ID = "A" & i
        form1.Controls.Add(txt)
    Next
End Sub

Protected Sub GetId(ByVal sender As Object, ByVal e As EventArgs)
    Dim id As String = ""

    For Each textBox As TextBox In form1.Controls.OfType(Of TextBox)()
        id += textBox.ID & ","
    Next

    ScriptManager.RegisterStartupScript(Me, Me.GetType(), "", "alert('" & id.Trim(","c) & "');", True)
End Sub

Screenshot